Python 3 - Modules Quiz - Question #5

Question

The answer to this quiz question is "6." However, I cannot seem to figure out why that is so...

We define the function to take the argument "x."
Then we set "res" to mean zero.
Next, for "i" in a range of this same variable "x," we will add "res," which is zero. This literally doesn't seem to add anything. (Zero plus any number results in the original number--the zero principle of addition, right?)

Then it says to "return 'res'," which makes "res" the new number for "i?"

Finally, the last line runs through the program using 4 as the argument. To "i" in a range of 4, add 0. That gives us 4, no? But the answer is 6....Hmm.

_____
"What is the output of this code?"
def func(x):
res = 0
for i in range(x):
res += i
return res

print(func(4))
____

Answer 1

numbers in range (4) are 0,1,2,3
res= 0

for loop :
i = 0 , res= res+i = 0+0 = 0
i = 1, res= res+i = 0+1 = 1
i = 2, res= res+i = 1+2 = 3
i = 3, res= res+i = 3+3 = 6

hope it helps :D

Answer 2

This does help. Thanks much Voja!

Answer 3

8

Answer 4

the answer is 8